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Ultrasonic nondestructive evaluation of corrosion damage in concrete reinforcement bars

机译：混凝土钢筋混凝土腐蚀损坏超声波无损评价

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Corrosion of reinforcement bars which are embedded in concrete is one of the significant problems encountered in reinforced concrete structures. Despite the fact that concrete gives protection against corrosion, aggressive environmental conditions can lead to the corrosion of the reinforcement bars embedded in concrete. This may affect the strength of the concrete structures which leads to catastrophic failures during the service. Assessment of the extent of corrosion in embedded reinforcement bars nondestructively is the main objective of this research work. Grade M30 concrete mixture was used for the preparation of rectangular square blocks as testing samples. Concrete specimens with embedded steel bars of 10 mm, 16 mm, 20 mm and 25 mm diameters have been subjected to accelerated corrosion using `Impressed Current Technique' for different time periods. The ultrasonic velocities through the concrete samples with corroded reinforcement bars were measured against the corrosion time and the bar diameters. For these measurements Portable Ultrasonic Nondestructive Digital Indicating Tester (PUNDIT) was used. The weight loss due to corrosion of the reinforcement bars were measured subsequently, and those readings were evaluated against the ultrasonic velocities. The ultrasonic velocity decreases with the time and the extent of corrosion.
机译：这是埋在混凝土中的钢筋腐蚀是钢筋混凝土结构中遇到的显著问题之一。尽管具体给出了防腐蚀保护，恶劣环境条件下可导致嵌在混凝土中钢筋的腐蚀。这可能会影响其服务过程中导致灾难性故障的混凝土结构的强度。腐蚀的嵌入式钢筋程度的评估无损是这项研究工作的主要目标。用于制备矩形正方形块作为测试样本M30级混凝土混合物。具有10mm，16个毫米，20毫米和25mm直径嵌入钢筋混凝土试样都使用`外加电流技术”的不同的时间段进行加速腐蚀。通过锈蚀钢筋的混凝土样品的超声波速度都能够抵抗腐蚀时间和棒的直径来测量。对于这些测量中使用便携式超声波无损数字指示仪（PUNDIT）。由于钢筋的腐蚀的失重随后测定，这些读数被抵靠超声波速度进行评价。超声波速度随时间和腐蚀的程度减小。

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